402491659 has 4 divisors (see below), whose sum is σ = 403632216. Its totient is φ = 401351104.

The previous prime is 402491647. The next prime is 402491669. The reversal of 402491659 is 956194204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402491659 - 2⁵ = 402491627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402491669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569749 + ... + 570454.

It is an arithmetic number, because the mean of its divisors is an integer number (100908054).

Almost surely, 2^402491659 is an apocalyptic number.

402491659 is a deficient number, since it is larger than the sum of its proper divisors (1140557).

402491659 is a wasteful number, since it uses less digits than its factorization.

402491659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140556.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 402491659 is about 20062.1947702638. The cubic root of 402491659 is about 738.3330257421. Note that the first 3 decimals are identical.

The spelling of 402491659 in words is "four hundred two million, four hundred ninety-one thousand, six hundred fifty-nine".